Abstract: Dynamics of drop spreading for water and ethanol absolute on polypropylene (840A) and terylene (728) was investigated using a CCD camera to deal with the problems caused by material and water distribution of wet electrostatic precipitator (ESP). The results show that the contact angles for water on 728 and 840A were 52.5° and 136.2°, respectively, and the contact angles for ethanol absolute on 728 and 840A were 46.5° and 41.9°, respectively. It was observed that the overall duration of the spreading process can be divided into two stages, namely initial stage and later stage. The following rules of drop spreading for water and ethanol absolute on 728 were ExpAssoc and Hill, and the diffusion shapes were elliptical. The shapes for water and ethanol absolute on 840A were circular and elliptical, respectively. The following rule of drop spreading for ethanol absolute on 840A was Hill. The effects of several parameters on drop spreading were obvious, such as the assemblages into strands of fabrics, the properties and size of drop, the thickness of fabrics and the surface free energy of material.